Update README for new features

Document freehand exclusions, persistent shapes, and new config options (language, exclusion reset).

README.md

@@ -9,10 +9,10 @@
 ## Features
 - Two synced previews (original + overlay)
 - Hue/Sat/Value sliders with presets and image colour picker
-- Exclusion rectangles to ignore regions
-- Theme toggle (light/dark) with rounded toolbar buttons
-- Folder support with previous/next navigation
-- Quick overlay export (PNG) and optional defaults via `config.toml`
+- Exclusion rectangles or freehand polygons that persist while browsing
+- Theme toggle (light/dark) with rounded toolbar buttons and accent-aware highlights
+- Folder support with wrap-around previous/next navigation
+- Quick overlay export (PNG) with configurable defaults and language settings via `config.toml`
 
 ## Requirements
 - Python 3.11+ (3.10 works with `tomli`)
@@ -34,12 +34,19 @@ The launcher copies Tcl/Tk resources into the virtualenv on first run, so no man
 1. Load an image (`📂`) or a folder (`📁`).
 2. Pick a colour (`🎨` dialog, `🖱️` image click, or preset swatch).
 3. Fine‑tune sliders; watch the overlay update on the right.
-4. Move through folder images with `⬅️` / `➡️`.
-5. Draw exclusions with right drag; reset or save when ready.
+4. Toggle freehand mode (`△`) or stick with rectangles and mark areas to exclude (right mouse drag).
+5. Move through folder images with `⬅️` / `➡️`; exclusions stay put unless you opt into automatic resets.
+6. Save an overlay (`💾`) when ready.
 
 ## Config Defaults
 Optional `config.toml`:
 ```toml
+[language]
+language = "en"          # match files in app/lang (en, de)
+
+[options]
+reset_exclusions_on_image_change = false
+
 [defaults]
 hue_min = 250.0
 hue_max = 310.0
@@ -54,7 +61,8 @@ alpha = 120
 app/
   app.py          # main app assembly
   gui/            # UI, theme, picker mixins
-  logic/          # image ops, defaults, reset
+  logic/          # image ops, defaults, config helpers
+  lang/           # localisation TOML files
 config.toml       # optional defaults
 main.py           # entry point
 ```